Mysterious Metal Balls Found On Ocean Floor

February 19, 2015 1:47 PM

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This April 21, 2010 photo shows a hawksbill sea turtle as it cruises over a reef just off the shore of Curacao. From mesmerizingly decorative buildings to lush coral reefs beneath sparkling turquoise waters, this Dutch Caribbean island has more than enough sights on land and under the sea to keep visitors restfully busy for a week. (AP Photo/Brian Witte)

This April 9, 2012 photo provided by NOAA shows french grunts swimming around sponges and coral off the northeast coast of Puerto Rico, taken as part of the National Oceanic and Atmospheric Administration (NOAA) sea-floor habitat research project aboard NOAA's Nancy Foster ship. In a three-week proj...